US 2069958 A
Description (OCR text may contain errors)
Feb. 9, l937- A. A. DIEMER KOOL 2,059,953
IMPLEMENT FOR CONDITIONING LAWNS Filed Aug. 7, 1954 Fig.3
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Patented 'Feb. 9, 1937 IIWPLEMENT FOR CONDITIONING LAWNS Alexander Anthon' Diemer Koo], Aerdenhout, Netherlands Application August 7, 1934, Serial No. 738,836 In Great Britain August 11, 1933 2 Claims.
My invention relates to an implement for conditioning lawn on grass plots of any kind, for instance, on sporting places such as cricket grounds, golf links, bowling greens, etc.
It is an object of my invention to provide an implement for the purpose specified which sets up the blades of the grass so as to admit light and air to their roots, removes loose and withered blades of grass, leaves, twigs, and other foreign matter, but does neither break up the ground nor damage the roots of the grass.
To this end, I provide an implement which comprises a base plate and blunt spikes distributed over the base plate. In appearance, the implement resembles a harrow but its function is i Referring now to Fig. 4, the spikes 3 may be nails whose sharp points have been removed. The nails are driven into and through the base plate I which, in this case, is a board, from above,
but obviously this is only one way of fixing the nails or spikes 3.
that of a rake as the points of its spikes are blunt and move on the surface of the ground, without penetrating into it.
In the drawing affixed to this specification and forming part thereof an implement embodying my invention and equipped with wheels and a drawbar, is illustrated diagrammatically by way of example.
In the drawing Fig. 1 is an elevation. showing the implement in position for operation,
Fig. 2 is an elevation showing the implement inverted and running on its wheels,
Fig. 3 is a. plan view of Fig. 1,
Fig. 4 is a section drawn to a larger scale and showing a portion of the base plate with the spikes and the means for holding them. I
Referring now to the drawing,'and first to Figs. 1 to 3, the base plate I which supports the blunt spikes 3, is preferably made of wood-and may be of rectangular shape, as shown in Fig. 3. It is equipped with a top plate Ill-which may be of sheet metal, and surrounded by a frame H which may be of the same material. Metal strips 4 are secured to the top plate ID at opposite sides thereof and held by means such as screws iii. The implement is-intended to move in the direction of the arrow in'Fig. 1. i4 is a bracketwhich is arranged at the rear of the leading edge. The ends of the bracket are placed on the strips.4, and held by four of the screws l3. A drawbar 5, with a handle 9, is attached to the bracket M at [5 and braced by a pair of members It. Two
By way of-example, the base plate or board I may be made of elm wood, and may be 39% in. long, 21 in. wide, and 2% in. thick. The nails or spikes 3 may be pitched as desired; in. the base plate referred to the pitch is such that spikes are positioned in an area whose sides are spaced inwardly from the sides of the base plate for 1% to 2 in. The spikes are so long that their lower ends project from the lower face of the plate I for about 2% in. The frame II is about in. thick, and the top plate H may be of the same thickness.
An implement of this size weighs about lbs. The weight of the implement is thus about 0.2 pound per square inch of the operating surface; that is, the surface provided with spikes. The
' number of the spikes used and their spacing is more brackets 6 are supported on the strips 4' near the trailing edge of the implement and held by four screws I3. I are bearings on the brackets 6 for supporting an axle 8 on which two wheels 2 are fixed. Draw hooks l2 may be placed on the strips 4 in front of the ends of bracket i4, and held by two screws l3.
such that they merely move over the surface of the ground without penetrating it and without damaging the roots of the grass.
In operation, the implement is wheeled to the beginning of the lawn, where it is turned over and dragged over the lawn, so that the spikes 3 set up the blades of the grass. At the end of the lawn the implement is turned over onto its wheels and wheeled in position to treat on the'return' journey a second strip adjacent to the first, after having been again turned over. This operation is continued until the entire lawn has been treated.
In a preferred way of using the implement the lawn'is treated first lengthwise and then crosswise. The action of the implement on the blades of the grass is shown in Fig. 4, it being assumed that the implement is drawn along in the direction of the arrow.
By means of my improved implement a lawn is rapidly and efficiently conditioned or prepared for mowing. Since many spikes 3 are distributed overthe area which is spaced from the sides of the base plate I, as described, the weight carried by each individual spike is small, and so the spikes 55 I and do not damage the roots of the grass while setting up the blades, admitting light and air and removing foreign matter, as described.
The action of a mowing machine is not quite uniform, and it will always leave some blades which are longer than those which have been cut to the proper length. Some such long blades are shown at a in Fig. 4. The action of the implement according to my invention is to straighten these blades, as at b, preparatory to mowing. Blades extending in another direction are set up at thesubsequent crosswise treatment.
The treatment with the implement according to my invention results in the grass being strengthened. Continuous treatment will result in a thicker sod, whereby the growth of weeds is impeded.
The weight and dimensions of the implement may be varied according to circumstances so as to produce an optimum eifect on the grass. Additional drawing means may be connected to th hooks I2.
I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.
In the claims afilxed to this specification no selection of any particular modification of the invention is intended to the exclusion of other modifications thereof and the right to subsequently make claim to any modification not covered by these claims is expressly reserved.
'1. An implement for conditioning lawns by dragging comprising in combination, a large and heavy base plate, a great number of short rigid spikes with blunt ends projecting from one side of and distributed substantially all over said base plate in closely spaced relation, the number and spacing of said spikes being such that they merely move over the surface of the ground without penetrating the same to set up the blades of grass without damaging the roots of the grass, and means for moving said implement over the lawn.
2. An implement for conditioning lawns by dragging which comprises a large and heavy base plate, a'largenumber of short, closely spaced, rigid spikes having blunt ends projecting from one side of said base plate, the number and spacing of said spikes being such that they merely move over the surface of the ground without penetrating the same to set up the blades of grass without damaging the roots of the grass, the weight of said implement per square inch of spiked surface amounting to about 0.2 pound.
ALEXANDER AN'I 'HON DIEMER KOOL.